#include <string.h> int main() { char answer[42]; strcpy(answer, "undefined will tell you the answer to life the universe and everything,"); strcpy(answer, "but first of all, she is very sorry that Hydro meets some issues now."); strcpy(answer, "please wait patiently, or contact undefined impatiently about this error."); return 0; } /* (problem_files.html) [Line 14, Column 27] TypeError: Cannot read properties of undefined (reading 'toString') Template render error: (problem_files.html) [Line 14, Column 27] TypeError: Cannot read properties of undefined (reading 'toString') at Object._prettifyError (nunjucks/src/lib.js:32:11) at nunjucks/src/environment.js:464:19 at eval (eval at _compile (nunjucks/src/environment.js:527:18), :156:12) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :128:12) at b_content (eval at _compile (nunjucks/src/environment.js:527:18), :234:3) at b_body (eval at _compile (nunjucks/src/environment.js:527:18), :127:28) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :155:83) at b_ogp (eval at _compile (nunjucks/src/environment.js:527:18), :198:1) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :70:82) at nunjucks/src/environment.js:512:9 at Template.root [as rootRenderFunc] (eval at _compile (nunjucks/src/environment.js:527:18), :148:1) at Template.getExported (nunjucks/src/environment.js:508:10) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :36:6) at Nunjucks.getTemplate (nunjucks/src/environment.js:225:9) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :34:5) at nunjucks/src/environment.js:512:9 at Template.root [as rootRenderFunc] (eval at _compile (nunjucks/src/environment.js:527:18), :39:1) at Template.getExported (nunjucks/src/environment.js:508:10) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :31:6) at Nunjucks.getTemplate (nunjucks/src/environment.js:225:9) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :29:5) at nunjucks/src/environment.js:512:9 at Template.root [as rootRenderFunc] (eval at _compile (nunjucks/src/environment.js:527:18), :36:1) at Template.getExported (nunjucks/src/environment.js:508:10) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :26:6) at Nunjucks.getTemplate (nunjucks/src/environment.js:225:9) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :24:5) at nunjucks/src/environment.js:512:9 at Template.root [as rootRenderFunc] (eval at _compile (nunjucks/src/environment.js:527:18), :266:1) at Template.getExported (nunjucks/src/environment.js:508:10) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :21:5) at Nunjucks.getTemplate (nunjucks/src/environment.js:225:9) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :19:5) at nunjucks/src/environment.js:512:9 at Template.root [as rootRenderFunc] (eval at _compile (nunjucks/src/environment.js:527:18), :57:1) at Template.getExported (nunjucks/src/environment.js:508:10) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :16:5) at Nunjucks.getTemplate (nunjucks/src/environment.js:225:9) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :14:5) at nunjucks/src/environment.js:512:9 at Template.root [as rootRenderFunc] (eval at _compile (nunjucks/src/environment.js:527:18), :951:1) at Template.getExported (nunjucks/src/environment.js:508:10) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :11:5) at Nunjucks.getTemplate (nunjucks/src/environment.js:225:9) at Template.root [as rootRenderFunc] (eval at _compile (nunjucks/src/environment.js:527:18), :9:5) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :28:16) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :24:46) at eval (eval at _compile (nunjucks/src/environment.js:527:18), :24:83) at Nunjucks.getTemplate (nunjucks/src/environment.js:225:9) at Template.root [as rootRenderFunc] (eval at _compile (nunjucks/src/environment.js:527:18), :18:5) */

首先将坐标转成$(n-1)\times(n-1)$的格子,每次标记一个数，就标记对应的行列和对角线，如果某次恰好标记n次了，就达成了bingo

#include<bits/stdc++.h>
using namespace std;
const int N=2e3+10;
int row[N],col[N],dg[2*N],ndg[2*N];
int main()
{
	int n,m;
	cin>>n>>m;
	for(int i=1;i<=m;i++)
	{
		int x;
		cin>>x;
		x--;
		int r=x/n,c=x%n;
		row[r]++;
		col[c]++;
		dg[r-c+N]++;
		ndg[r+c]++;
		//cout<<row[r]<<" "<<col[c]<<" "<<r<<" "<<c<<endl;
		if(row[r]==n||col[c]==n||dg[r-c+N]==n||ndg[r+c]==n)
		{
			cout<<i;
			return 0;
		}
	}
	cout<<-1;
	return 0;
}